Merge branch 'increase-paid-signup-flow-experiment-ratio' into 'master'

Increase experimentation ratio for paid signup flow

See merge request gitlab-org/gitlab!23963

lib/gitlab/experimentation.rb

@@ -20,7 +20,7 @@ module Gitlab
       paid_signup_flow: {
         feature_toggle: :paid_signup_flow,
         environment: ::Gitlab.dev_env_or_com?,
-        enabled_ratio: 0.1,
+        enabled_ratio: 0.25,
         tracking_category: 'Growth::Acquisition::Experiment::PaidSignUpFlow'
       }
     }.freeze